People don’t adopt their ideologies at random, or by soaking up whatever ideas are around them. People whose genes gave them brains that get a special pleasure from novelty, variety, and diversity, while simultaneously being less sensitive to signs of threat, are predisposed (but not predestined) to become liberals. They tend to develop certain “characteristic adaptations” and “life narratives” that make them resonate—unconsciously and intuitively—with the grand narratives told by political movements on the left (such as the liberal progress narrative). People whose genes give them brains with the opposite settings are predisposed, for the same reasons, to resonate with the grand narratives of the right (such as the Reagan narrative).
Once people join a political team, they get ensnared in its moral matrix. They see confirmation of their grand narrative everywhere, and it’s difficult—perhaps impossible—to convince them that they are wrong if you argue with them from outside of their matrix. I suggested that liberals might have even more difficulty understanding conservatives than the other way around, because liberals often have difficulty understanding how the Loyalty, Authority, and Sanctity foundations have anything to do with morality. In particular, liberals often have difficulty seeing moral capital, which I defined as the resources that sustain a moral community.